#include <assert.h>
#include <stdio.h>
#include "wavdevice.h"

//==========================================================================>>
// Audio data conversion tables
//==========================================================================>>

unsigned char flip_byte[] = {
    0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
    0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
    0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
    0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
    0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
    0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
    0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
    0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
    0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
    0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
    0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
    0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
    0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
    0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
    0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
    0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};

unsigned short alaw_to_s16[] = {
    0x13fc, 0xec04, 0x0144, 0xfebc, 0x517c, 0xae84, 0x051c, 0xfae4,
    0x0a3c, 0xf5c4, 0x0048, 0xffb8, 0x287c, 0xd784, 0x028c, 0xfd74,
    0x1bfc, 0xe404, 0x01cc, 0xfe34, 0x717c, 0x8e84, 0x071c, 0xf8e4,
    0x0e3c, 0xf1c4, 0x00c4, 0xff3c, 0x387c, 0xc784, 0x039c, 0xfc64,
    0x0ffc, 0xf004, 0x0104, 0xfefc, 0x417c, 0xbe84, 0x041c, 0xfbe4,
    0x083c, 0xf7c4, 0x0008, 0xfff8, 0x207c, 0xdf84, 0x020c, 0xfdf4,
    0x17fc, 0xe804, 0x018c, 0xfe74, 0x617c, 0x9e84, 0x061c, 0xf9e4,
    0x0c3c, 0xf3c4, 0x0084, 0xff7c, 0x307c, 0xcf84, 0x030c, 0xfcf4,
    0x15fc, 0xea04, 0x0164, 0xfe9c, 0x597c, 0xa684, 0x059c, 0xfa64,
    0x0b3c, 0xf4c4, 0x0068, 0xff98, 0x2c7c, 0xd384, 0x02cc, 0xfd34,
    0x1dfc, 0xe204, 0x01ec, 0xfe14, 0x797c, 0x8684, 0x07bc, 0xf844,
    0x0f3c, 0xf0c4, 0x00e4, 0xff1c, 0x3c7c, 0xc384, 0x03dc, 0xfc24,
    0x11fc, 0xee04, 0x0124, 0xfedc, 0x497c, 0xb684, 0x049c, 0xfb64,
    0x093c, 0xf6c4, 0x0028, 0xffd8, 0x247c, 0xdb84, 0x024c, 0xfdb4,
    0x19fc, 0xe604, 0x01ac, 0xfe54, 0x697c, 0x9684, 0x069c, 0xf964,
    0x0d3c, 0xf2c4, 0x00a4, 0xff5c, 0x347c, 0xcb84, 0x034c, 0xfcb4,
    0x12fc, 0xed04, 0x0134, 0xfecc, 0x4d7c, 0xb284, 0x04dc, 0xfb24,
    0x09bc, 0xf644, 0x0038, 0xffc8, 0x267c, 0xd984, 0x026c, 0xfd94,
    0x1afc, 0xe504, 0x01ac, 0xfe54, 0x6d7c, 0x9284, 0x06dc, 0xf924,
    0x0dbc, 0xf244, 0x00b4, 0xff4c, 0x367c, 0xc984, 0x036c, 0xfc94,
    0x0f3c, 0xf0c4, 0x00f4, 0xff0c, 0x3e7c, 0xc184, 0x03dc, 0xfc24,
    0x07bc, 0xf844, 0x0008, 0xfff8, 0x1efc, 0xe104, 0x01ec, 0xfe14,
    0x16fc, 0xe904, 0x0174, 0xfe8c, 0x5d7c, 0xa284, 0x05dc, 0xfa24,
    0x0bbc, 0xf444, 0x0078, 0xff88, 0x2e7c, 0xd184, 0x02ec, 0xfd14,
    0x14fc, 0xeb04, 0x0154, 0xfeac, 0x557c, 0xaa84, 0x055c, 0xfaa4,
    0x0abc, 0xf544, 0x0058, 0xffa8, 0x2a7c, 0xd584, 0x02ac, 0xfd54,
    0x1cfc, 0xe304, 0x01cc, 0xfe34, 0x757c, 0x8a84, 0x075c, 0xf8a4,
    0x0ebc, 0xf144, 0x00d4, 0xff2c, 0x3a7c, 0xc584, 0x039c, 0xfc64,
    0x10fc, 0xef04, 0x0114, 0xfeec, 0x457c, 0xba84, 0x045c, 0xfba4,
    0x08bc, 0xf744, 0x0018, 0xffe8, 0x227c, 0xdd84, 0x022c, 0xfdd4,
    0x18fc, 0xe704, 0x018c, 0xfe74, 0x657c, 0x9a84, 0x065c, 0xf9a4,
    0x0cbc, 0xf344, 0x0094, 0xff6c, 0x327c, 0xcd84, 0x032c, 0xfcd4
};

//==========================================================================>>
// WaveOutPcm16MonoDevice
//==========================================================================>>

void WaveOutPcm16MonoDevice::clearWvhdrlist( wvhdrknot *knot )
{
    if ( knot ) {
        clearWvhdrlist( knot->next );
        delete knot;
    }
}

WaveOutPcm16MonoDevice::WaveOutPcm16MonoDevice( unsigned long aBufSize )
    : hwave(0), wvhdrlist(0)
{
    for ( int i = 0; i < NUM_OF_BUFFERS; i++ ) {
        buf[i] = new byte[aBufSize];
        assert( buf[i] );
        stateBuf[i] = bufstate_free;
    }

    nBufSize = aBufSize;

    WAVEFORMATEX wfex;

    wfex.wFormatTag = WAVE_FORMAT_PCM;
    wfex.nChannels = 1;
    wfex.nSamplesPerSec = 8000;
    wfex.wBitsPerSample = 16;
    wfex.nBlockAlign = (wfex.wBitsPerSample*wfex.nChannels)>>3;
    wfex.nAvgBytesPerSec = wfex.nSamplesPerSec*wfex.nBlockAlign;

    MMRESULT mmresult = waveOutOpen( &hwave, WAVE_MAPPER, &wfex, 0, 0, WAVE_FORMAT_DIRECT );
    if ( mmresult != MMSYSERR_NOERROR )
        fprintf( stderr, "Failed to open an audio output device, error=0x%lx\n", mmresult );
    else
        fprintf( stderr, "Audio output device opened, hwave=0x%lx\n", hwave );
}

WaveOutPcm16MonoDevice::~WaveOutPcm16MonoDevice()
{
    for ( int i = 0; i < NUM_OF_BUFFERS; i++ )
        delete[] buf[i];

    if ( !hwave )
        return;

    MMRESULT mmresult = waveOutReset( hwave );
    if ( mmresult != MMSYSERR_NOERROR )
        fprintf( stderr, "Failed to reset the audio output device 0x%lx, error=0x%lx\n", hwave, mmresult );
    else
        fprintf( stderr, "Audio output device 0x%lx reset\n", hwave );

    mmresult = waveOutClose( hwave );
    if ( mmresult != MMSYSERR_NOERROR )
        fprintf( stderr, "Failed to close the audio output device 0x%lx, error=0x%lx\n", hwave, mmresult );
    else
        fprintf( stderr, "Audio output device 0x%lx closed\n", hwave );

    clearWvhdrlist( wvhdrlist );
}

byte *WaveOutPcm16MonoDevice::GetBuffer()
{
    for ( int i = 0; i < NUM_OF_BUFFERS; i++ )
        if ( stateBuf[i] == bufstate_free ) {              // !!! Not thread-safe
            stateBuf[i] = bufstate_filled;
            return buf[i];
        }
        else
            if ( (stateBuf[i] == bufstate_played) && (wvhdr[i].dwFlags & WHDR_DONE) ) {
                stateBuf[i] = bufstate_filled;
                return buf[i];
            }
   return 0;
}

void WaveOutPcm16MonoDevice::BufferIsReady( const unsigned char *buffer, unsigned long nBufLen )
{
    MMRESULT mmresult;
    int i;

//    os.write( buffer, nBufLen );

    for ( i = 0; i < NUM_OF_BUFFERS; i++ )
        if ( buffer == buf[i] )
            break;

    assert( i < NUM_OF_BUFFERS && stateBuf[i] == bufstate_filled );

    wvhdr[i].lpData = (char*)buf[i];
    wvhdr[i].dwBufferLength = nBufLen;
    wvhdr[i].dwFlags = 0;

    mmresult = waveOutPrepareHeader( hwave, &wvhdr[i], sizeof(wvhdr[i]) );
    if ( mmresult != MMSYSERR_NOERROR ) {
        fprintf( stderr, "Failed to prepare a header for the audio output device 0x%lx, error=0x%lx\n", hwave, mmresult );
        return;
    }

    stateBuf[i] = bufstate_played;

    mmresult = waveOutWrite( hwave, &wvhdr[i], sizeof(wvhdr[i]) );
    if ( mmresult != MMSYSERR_NOERROR ) {
        fprintf( stderr, "Failed to write to the audio output device 0x%lx, error=0x%lx\n", hwave, mmresult );
        return;
    }
}

void WaveOutPcm16MonoDevice::Write( const unsigned char *buf, unsigned long nBufLen )
{
// Not implemented
}

